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The Subject
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So the prof shows us how to tell if an object is red shifted, by comparing two spectra (i assume of the same object). The emission lines had similar gaps but were shifted right, therefore moving away from us.
How can you obtain two different spectra of the same object if it's constantly moving away from us? Wouldn't it only produce one red shifted spectra?
My understanding isn't clear.
How can you obtain two different spectra of the same object if it's constantly moving away from us? Wouldn't it only produce one red shifted spectra?
My understanding isn't clear.